Liquid-operated jack



LMLZ,

2 SHEETS-SHEET l.

F. J. LEISSE.

LIQUID OPERATED JACK.

FILED FEB. 28. 1921.-

Jan. 9, 1923 Jan. 9, 1923. LMLZ F. 1. LEISSE.

LIQUID OFERATED JACK.

FILED FEB. 28,1921. 2 SHEETS-SHEET 2.

I NV EN TOR.

A TTORN E Y.

atented dan. 9, 1923. i

ITED' STATES FREDRICK J'. LEISSE, 0F ST. LOUIS, MISSOURI.

LIQUID-OPEBATED JACK..

Application tiled February 28, 1921. Serial No. 448,406.

To all whom it may concern:

Be it known that I, Fransman J. Linsen, a citizen of the United States, residing at St. Louis, in the county of St. Louis and State of Missouri, have invented certain new and useful Improvements in Liquid-Operated Jacks, of which the following 1s a specification.

This invention relates to liquid operated jacks and has for an objectI the provision of a device which may be used for hoisting vehicles or the like, especially where a wheel of the vehicle is in need of repair.

Another object of the invention is to provide a jack which may be raised or lowered with the expenditure of very little physical effort and which will quickly and effectively lift the vehicle to any predetermined height.

A further object is to provide a jack which is especially adapted for use in garages and is so constructed that its transfer from place to place may be done in a facile manner, thus making the device practical t'or use in being transported from one vehicle to another.

The above and other objects of this invention will be more fully understood from the following description taken in connec.

-tion with the accompanying drawings,

wherein: v

Fig. 1, is a side elevational view of a jack constructed in accordance with this invention.

Fig. 2, is a horizontal sectional view of one end of the base showing the latter in top plan.

Fig. 3, is a detail fragmentary side elevational view of the device showing to advantage the jack staff, the locking means therefor and the means by which the lock is released.

Fig. 4, is a fragmentary side elevational view of the lock releasing means, and

Fig. 5, is a top plan view of the same.

1n the drawings, in order to illustrate the application of this invention, a complete device embodying a liquid reservoir and pump is shown, although lit is to be understood that these elements do notof necessity constitute an inherent part of the jack, since the reservoir and pump may con,- stitute a source of supply and energy, respectively, which may be placed in communication with the jack per se in any desired manner.

rlihe device illustrated consists of a base generally designated 6, the base embody mg a stand 7 at one end and a stand 8 at the opposite end. The stand 8 has mounted thereon a casin 9, Which has a way leadlng therethroug one end ofv which is in communication with one end of a liquid channel 10, while the opposite end is in communication with one end of a jack cylinder 11. A, portion of the casing 9 is eX- tended to provide a shelf 12, upon which is fiXedly mounted an axle 13, the latter being4 equipped with wheels 14;, through the medium of which the jack may be transported.

Beciprocabl, mounted in the cylinder 11 is a jacksta 15, the lower end of which is formed to provide a piston head While the upper end is-formed to provide a vehicle engaging saddle 16 of standard design. rllhe upper end of the cylinder is equipped with a reinforcing collar 17, upon which is mounted, at diametrically opposite points, tapering lugs l18. As shown in Fig. 1, the upper ends of the lugs terminate at approximately the upper marginal edge of the collar 17, the said upper ends being wider to provide substantial supporting surfaces.

A locking'member 19 .is mounted upon the staff 15 and is held in any desired position thereon by an annulus 20 which has mounted therein a set screw 21. Conse quently, as is apparent the collar may be set at any desired position on the staff 15, thereby correspondingly controllingv the movement of the locking member. The said lockmg member comprises an elongated strap having a. circular enlargement formed on its upper end through which the staff 15 passes. rlihe opposite ends of the strap are bent downwardly into parallelism with each other, each having one of its margins formed to provide ratchet teeth 22, which taper in a direction counter to the direction of taper of the lugs 18. Upon reference to Fig. 3 of the drawings, it will be noted that the portion of the locking member which embraces the staff 15 has its bore made relatively larger than the diameter of the latter, consequently, lateral movement of the locking member will be permitted to permit engagement of said locking member with or disengagement of the same froml the lugs 18.

The liquid. channel 1() has the opposite end, to Ithat whichis engaged with Vthe casing 9, 1n communication with. the base 23 desired configuration and has an outlet pipe 25 leading therefrom adjacent the base 23 and in communication with the channel 10 at a point remote from the pump. In the present instance a-liquid reservoir 26 is arranged in parallel relation to the pump 24,

s Ymounted in the cylinder of the pump 24. A A

\ movement of the duct 31 connects the reservoir to the pump 24, and isprovided with a one-way valve permitting passage of liquid from the reservoir to the pump, but preventing a reverse liquid. The pipe 25 is likewise equipped with a one-way outlet valve which permits passage of the liquid from the pump 24, but prevents return ofy the li uid into the pump through said pipe. eturn of the liquid from the channel 10 vis accomplished through the use of a return pipe 32, one end of the latter being in communicationv with said channel, and the opposite end in communication with the reservoir 26.

It will be apparent from the above that when the handle 29 is moved Aupwardly a suction stroke of the piston will be produced, thereby drawing liquid from the reservoir 26 through the duct 31 and into the pump cylinder. The downward movement of the handle will cause the liquid to be forced from the pump cylinder through the pipe 25 into the channel 10 and ultimately through the liquid way in the casing 9 and into the cylinder 11, causing the piston therein to be elevated which correspondingly elevates the j ackstaff 15. When the jack staff has been elevated to the desired height., pressure on the handle 29 is released and the ratchet faces of the lock 19 per- 'mitted to gravitate into engagement with the lugs 18, thereby positively retaining the jack staff from downward movement, if perchance the liquid in the cylinder 11 would be insutlicient to hold the weight imposed upon the saddle 16. When it is desired to lower the jack staff pressure is exerted upon the pump lever 29 to take the weight oifthe lock 19 and then pressure is exerted uponl a releasing lever 33, the latter being connected to a valve which is mounted in the return pipe 32. The lower end of said lever is in pivotal connection with one end of a releasing rod 34,

the opposite end of the lattei' vbeing connected to a releasing element, generally designated 35. By operating the lever 33, the valve in the return pipe 32 will be`v opened, thereby permitting the liquid in the channel 1() to flow through said return pipe 32 and into the cylinder 26. The releasing element 35 consists of a rigid semi-circular collar, the opposite ends of which taper to edges. A resilient strap 37 is flexed into engagement with the inner periphery of the semicircular collar at diametrically opposite points. Consequently, pressure on the lever 33 will initially move the semi-circular collarinto a position where the tapered edges 36 thereof contact with the ratchet faces 22 of the lock 19'. Continuous pressure upon said lever 33 operates upon the resilient strap 37, causing .the lat- 80 ter to beilexed so as to permit opening movement of the valve in the return pipe 32 just momentarily before the semi-circular collar is movedto a point where it will urge the ends of the lock 19 from the lugs 18.

It is possible that at times the liquid used for operating the jack, which is preferably oil, may seep past the pistonin the cylinder 11 and consequently to catch any such leakage an overflow pipe 38 is provided, one end of which is in communication with the upper end fof the cylinder 11 and the opposite end in communication with the upperend of the reservoir 26, permitting this overflow to be ultimately sucked into the reservoir 26 by the siphonic action of the pump.

From the above, it will be apparent that the jack staff is raised to any desired point by the pressure of the oil or other liquid 100 which may be used and that the staff will be positively locked from casual displacement.

It is moreover apparent that the jack may be expeditiously lowered when desired with lthe expenditure of very little physical effort.

The construction of the device will permit quick andeective work, even on the heavier types of vehicles.

Various changes may be made in the device, especially in the details of construction, proportion and arrangement of parts within the scope of the `appended claims.

What is claimed is :v

1. A liquid operated jack including a cylinder carrying 4a vertically moving vehicle 115 supporting staff, means to force liquid beneath said staff to elevatelthe latter, mea-ns carried hy the staff and engaging the cylinder to automatically loc-k the stall' from downward movement after reaching a pi'e- 120 determined height, and mechanism to release said liquid and to disengage said second mentioned means. whereby the staff is permitted to graviate under its load.

2. liquid operated jack including a cyl- 12| inder and jack staff the former of which is provided with an inlet way to permit lthe introduction of liquid thereinto for elevating saidstafi', a lug mounted on the cylinder,

a locking member cooperable with said lug 18| to hold the stall at a predetermined heght, itially neutralize the efect of said pump and 10 and looking means carried by the staff to reto secondarily disengage said locking means tain said locking member in a predeterto permit the jack to gravitate under its load.

mined position on the staff. In testimony whereof I aiix my signature 3. A liquid operated jack including a jack in presence of two Witnesses.

and pump in communication, said pump FREDERICK J. LEISSE.

being operable to elevate the jack, means Witnesses:

to automatically look the jack at any de- JNO. J. MooRMAN,

Ysired height, and means operable to in- C. G. LINDSAY. 

